Pump



1933- J. s. ABERCYROMBIE ET'AL 1,399,298

PUMP

Fi led Jan. 15, 1932 James S. Abercrambie Jbseph A. Tnnant fferfier Allen Patented Feb. 28, 1933 UNITED STATES PATENT OFFICE JAMES S. ABERGROMBIE, JOSEPH A. TENNANT, AND HERBERT ALLEN, OF HOUSTON, TEXAS, ASSIGNORS, BY DIRECT AND MESNE ASSIGNMENTS, TO STEPHENS PUMP COMPANY, OF ROUND ROCK, TEXAS, A CORPORATION OF DELAWARE PUMP Application filed January 15, 1932. Serial No. 586,906.

This invention relates to pumps designed for pumping abrasive and corrosive fluids, of the general type disclosed by Letters Patent of the United States to Charles D. Stephens No. 1,832,259, of November 17, 1931.

This type of pump is particularly adapted for use as a mud or slush pump in deep Well drilling operations, but is capable of eflicient performance in various other fields. It includes a pumped fluid chamber, inlet and outlet valves therefor, a hollow expansible member within the chamber, and a reciprocable piston to actuate fluid confined within the member to cause expansion and contraction thereof, whereby fluid is drawn into and forced out of said chamber, the pumped fluid being thereby kept out of contact with the piston and associated parts to prevent wear thereof.

In certain instances, that portion-of the hollow expansible member immediately adjacent the exhaust port may expand excessively and blow out through the exhaust port. To prevent this and other objectionable results of improper expansion, the present in- 'vention has for its specific object the provision of new and improved means to limit the expansion of the hollow member.

Other objects will hereinafter appear.

The preferred embodiment of the invention is illustrated by the accompanying drawing, of which Fig. 1 is a fragmentary sectional elevation of a pump embodying the invention; and Fig. 2, a vertical section on the line 2-2 of Fig. 1.

In the drawing, the barrel 1 defines a pumped fluid chamber 2. The intake valve 3 permits entrance into the chamber 2 of pumped fluid from the intake pipe 4; and prevents the escape of pumped fluid from the chamber 2 into the intake pipe 4. The exhaust valve 5 permits the expulsion of pumped fluid from the chamber 2 into the exhaust pipe 6; and prevents the passage of fluid into the chamber 2 from the exhaust pipe 6.

Mounted within the chamber 2, and extending substantially from one end to the other, is a hollow expansible member 7, preferably made of rubber.

To limit the expansion of the expansible member 7, this invention provides the sub-' stantially rigid perforated member 8, coextensive therewith. One end of the member 8 fits in an annular groove 9 in one end wall i of the chamber 2. The otherend fits snugly in the opening 10 in the barrel 1 and has an internal annular flange 11.

One end of the expansible member 7 has an internal annular flange 12 compressed by and held between the clamp 13 and the adjacent end wall of the chamber. end of theexpansible member 7 has an exte:'n"al annular flange 14 compressed by and held between the internal annular flange 11 of the rigid member 8 and a ring 15 which is secured by bolts 16 to the barrel 1 and forms the adjacent end wall of the chamber 2. The ends of the expansible member 7 are thereby sealed to the end walls of the chamber 2, and the rigid memb r 8 is held in place.

Actuating fluid is introduced into the expansible member 7 through a suitable duct 17. The piston 18 is reciprocated by the rod 19 to cause expansion and contraction of the member 7. When the member 7 is contracted, the exhaust valve 5 is closed and the intake valve 3 opened so that fluid enters the chamber 2 from the intake pipe 4. When the expansible member 7 is expanded, the intake valve 3 is closed and the exhaust valve 5 is opened so that fluid is expelled through the exhaust pipe 6.

The rigid member 8 serves to limit the expansion of the expansible member 7 in amount and direction.

Other advantages will be apparent to those skilled in the art.

We claim:

In a pump: a chamber having inlet and exhaust ports; a hollow expansible member in said chamber and extending substantially from one end to the other; a tubular, perforated, and substantially rigid member in said chamber, extending substantially from The other one end to the other, and surrounding said Y expansible member to limit the expansion thereof; means to seal one end of said ex pansible member to one end of said chamber;

the other end of said expansible member having an external annular flange; the adpacent end of said rigid member having an internal annular flange; said flange of said expansible member being clamped between said flange of said rigid member and the adjacent end wall of said chamber so that said expansible member is sealed to said end wall and said rigid member is held in place.

In testimony whereof, we hereunto afiix our signatures.

JAMES S. ABERCROMBIE. JOSEPH A. TENNANT. HERBERT ALLEN. 

